I have a long string and I need to know the starting position of all
substrings matching a particular sequence. Most importantly, it needs
to be fast. Secondly, it would be nice if it was somewhat concise.
Here's the method:
def substring_positions(substring, string)
## fast, concise method??
end
my_substring = 'this'
my_string = 'this string this is a string this is it'
substring_positions(my_substring, my_string) # -> should return
[0, 12, 29]
This seems trivial to do, but looking at StringScanner, String#match,
and String#scan, nothing simple comes to mind. There must be a one-
liner somewhere for this kind of thing. I checked through facets and
didn't see anything...
Thanks